We don't really depend on mtl or network

No idea why they were there, it builds fine without.
Having these deps causes circular dependencies for package-based
distros like Gentoo since mtl and network are not in the core set
of libs and they both need cabal to build.

Cabal.cabal

@@ -3,7 +3,7 @@ Version: 1.1.5
 Copyright: 2003-2006, Isaac Jones
 -- Util dependency removed.  This may break ghc 6.2 builds :( Will
 -- have to figure something out for ghc 6.2
-Build-Depends: base, mtl, network
+Build-Depends: base
 License: BSD3
 License-File: LICENSE
 Author: Isaac Jones <ijones@syntaxpolice.org>